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Summary of Marketable Securities by Asset Type (Detail) - USD ($) $ in Thousands | May 31, 2018 | May 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | $ 169,950 | $ 163,113
Available-for-Sale Securities, Gross Unrealized Gains | 2,648 | 4,847
Available-for-Sale Securities, Gross Unrealized Losses | (4,527) | (3,505)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 168,071 | 164,455
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 145,956 | 140,231
Available-for-Sale Securities, Gross Unrealized Gains | 2,566 | 4,630
Available-for-Sale Securities, Gross Unrealized Losses | (3,967) | (3,322)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 144,555 | 141,539
Equity securities | Stocks | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost |  | 2,391
Available-for-Sale Securities, Gross Unrealized Gains |  | 76
Available-for-Sale Securities, Fair Value (Net Carrying Amount) |  | 2,467
Equity securities | Mutual funds | Foreign |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 46,123 | 35,169
Available-for-Sale Securities, Gross Unrealized Gains | 1,839 | 2,470
Available-for-Sale Securities, Gross Unrealized Losses | (1,197) | (204)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 46,765 | 37,435
Equity securities | Mutual funds | Domestic |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 99,833 | 102,671
Available-for-Sale Securities, Gross Unrealized Gains | 727 | 2,084
Available-for-Sale Securities, Gross Unrealized Losses | (2,770) | (3,118)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 97,790 | 101,637
Fixed maturity |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 23,994 | 22,882
Available-for-Sale Securities, Gross Unrealized Gains | 82 | 217
Available-for-Sale Securities, Gross Unrealized Losses | (560) | (183)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 23,516 | 22,916
Fixed maturity | U.S. Treasury and other government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 23,562 | 22,176
Available-for-Sale Securities, Gross Unrealized Gains | 39 | 120
Available-for-Sale Securities, Gross Unrealized Losses | (552) | (177)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | 23,049 | 22,119
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-Sale Securities, Amortized Cost | 432 | 706
Available-for-Sale Securities, Gross Unrealized Gains | 43 | 97
Available-for-Sale Securities, Gross Unrealized Losses | (8) | (6)
Available-for-Sale Securities, Fair Value (Net Carrying Amount) | $ 467 | $ 797

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